http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Control and Measurement System for the Tuning of a PEFP Low-Beta Superconducting RF Cavity
Zhang Liping,Sun An,Yingmin Li,Tang Yazhe,Yong Sub Cho 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.5
The superconducting RF (SRF) cavity is being considered to accelerate the proton beam in the proton engineering frontier project (PEFP) linac and for its post-project. In order to correct for the frequency shift and the field flatness variation of a TM010 mode in a raw PEFP multi-cell (SRF) cavity caused by manufacturing errors and welding shrinkage during its production, a field flatness tuning system has been developed. A new control and measurement system has been successfully developed for the relevant tuning system. The system automatically controls the bead's forward movement to a designated position and back to its original point and it also drives the network analyzer to measure and acquire the data on the SRF cavity while the bead is moving through the SRF cavity. After the bead has past through the cavity, the control and measurement system provides the cavity's field flatness and the tuning frequencies of the individual cells. The experiments in this study revealed that the control and measurement system is reliable. By using this control and measurement system, the field flatness of a PEFP low-beta cavity can be tuned from 75.62 % at 697.925 MHz to 1.43 % at 700 MHz, which can satisfy the control requirement.
Frequency and Length Adjustment of A PEFP Low-Beta Dumbbell
Changyi, Gao,An, Sun,Liping, Zhang,Yazhe, Tang,Yingmin, Li,Kim, Han-Sung,Cho, Yong-Sub The Korean Society of Superconductivity and Cryoge 2008 한국초전도저온공학회논문지 Vol.10 No.2
Superconducting RF cavities are being considered for accelerating a proton beam at 700 MHz in the linac of the Proton Engineering Frontier Project (PEFP) and its post-project. Dumbbell fabrication is a mid-process for manufacturing an elliptical superconducting RF cavity. During the dumbbell fabrication, control of the dumbbell length and the $TM010\;{\pi}$ mode frequencies is necessary to build up a desired cavity. A new formula with a perturbation measurement method is used to measure and calculate the frequencies of the individual half-cells of a PEFP low-beta dumbbell, and to tune the frequency and length of the half-cells. In this article, the tuning method and results of the PEFP low-beta dumbbells have been presented.